Devices audio1575(7D)
NAME
audio1575 - Uli M1575 Super South Bridge audio digital con-
troller interface.
DESCRIPTION
The audio1575 device uses the Uli M1575 AC97-compatible
audio digital controller and an AC-97 Codec to implement the
audio device interface. This interface allows analog only
inputs and outputs.
API
This interface is described in the audio(7I) and mixer(7I)
man pages.
Driver Versions
Applications that open /dev/audio may use the AUDIOGETDEV
ioctl(2) to determine which audio device is being used. The
audio1575 driver will return the string SUNW,audio1575 in
the name field of the audiodevice structure. The version
field contains the letter a and the config field contains
the string onboard1.
Platform Ver. Out H. Phone Speaker In Mic CD
Sun A70 Workstation a Y Y Y Y Y Y
Key to the above table: Ver = Version. Out = Line Out.
Speaker = Internal Speaker. In = Line In. Mic. = Microphone.
CD = CD-ROM.
The audio1575 device provides support for the internal
speaker, headphone, line out, line in, and microphone. The
play.modports and record.modports fields of the audioinfo
structure (see audio(7I)) indicate which ports may be mani-
pulated.
Audio Mixer Mode
This driver supports the mixer mode. Compat mode is sup-
ported only for Sampling Rate (8Khz-48Khz), Encoding (16 Bit
linear (PCM)), and Channels (Stereo) configurations.
Audio Data Formats
The audio1575 device natively supports 16-bit linear encod-
ings in stereo. With the mixer enabled, a continuous range
of sample rates from 8000 Hz to 48000 Hz is supported. With
the mixer disabled, the same sample rates are supported but
only for stereo 16 bit linear PCM encoding. The device can
be opened for simultaneous play and record whether the mixer
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Devices audio1575(7D)
is enabled or not.
Sample Granularity
Because the audio1575 device manipulates buffers of audio
data, the reported input and output sample counts will vary
at any time from the actual sample count by no more than the
size of the buffers the driver is transferring. Programs
should not rely on the absolute accuracy of the play.samples
and record.samples fields of the audioinfo structure.
Interrupt Rate
The driver determines how often play and record interrupts
should occur. For playing audio, this determines how often
and how much audio is requested from the audio mixer. The
impact of interrupts on recording is minimal, however, if a
very small read buffer size is set, the record interrupt
rate should be increased to prevent the buffer from over-
flowing. You can tune the play and record interrupt rates
using the /kernel/drv/audio1575.conf file.
Audio Status Change Notification
As described in the audio(7I) and mixer(7I) man pages, it is
possible to request asynchronous notification of changes in
the state of an audio device.
ERORS
All audio1575 errors are described in the audio(7I) man
pages.
FILES
/dev/audio
Symbolic link to the system's primary audio device (not
necessarily an audio1575 device).
/dev/audioctl
Control device.
/dev/sound/0
Represents the first audio device on the system (not
necessarily an audio1575 device).
/dev/sound/0ctl
Audio control.
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Devices audio1575(7D)
/usr/share/audio/samples
Audio sample files.
/kernel/drv/audio1575.conf
Audio1575 driver configuration file.
ATRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
ATRIBUTE TYPE ATRIBUTE VALUE
Architecture SPARC-based systems
Availability SUNWaudd, SUNWauda
Stability level Evolving
SEE ALSO
mixerctl(1), sdtaudiocontrol(1), ioctl(2), attributes(5),
audio(7I), mixer(7I), streamio(7I)
Uli M1575 Super South Bridge Data Sheet Data Sheet- Uli USA
Inc.
AD1981B AC '97 SoundMAX(R) Codec Data Sheet- Analog Devices
Inc.
http:/www.sun.com/io
DIAGNOSTICS
In addition to being logged, the following messages may
appear on the system console:
initstate() play interrupt rate set too low.
The play interrupt rate specified in audio1575.conf is
set too low. It has been reset to the rate specified in
the message. Update audio1575.conf to a higher play
interrupt rate.
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Devices audio1575(7D)
initstate() play interrupt rate set too high.
The play interrupt rate specified in audio1575.conf is
set too high. It has been reset to the rate specified in
the message. Update audio1575.conf to a lower play
interrupt rate.
initstate() record interrupt rate set too low.
The record interrupt rate specified in audio1575.conf is
set too low. It has been reset to the rate specified in
the message. Update audio1575.conf to a higher record
interrupt rate.
initstate() record interrupt rate set too high.
The record interrupt rate specified in audio1575.conf is
set too high. It has been reset to the rate specified in
the message. Update audio1575.conf to a lower record
interrupt rate.
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